Definition of "disporting"

I must fain resign all poetic disportings of the fancy, and pursue my narrative in humble prose.

1809, Diedrich Knickerbocker [pseudonym; Washington Irving], A History of New York, from the Beginning of the World to the End of the Dutch Dynasty. […], volumes (please specify |volume=I or II), New York, N.Y.: Inskeep & Bradford, […]